My question has to do with industry standard practices. The evaporator coil is leaking on my 9 year old Carrier AC. At 9 years the AC isn't real old but I have had problems with it and decided to replace the system with a 16-18 seer unit. I intend upon getting 3-4 bids for this work.
One of the contractors gave a price for running the Manual J calc.I don't want to pay for this three times. Should I have an independent run the calcs, or can I get one of the bidding contractors to run the numbers and supply the same print out to all?